为了在相位轮廓测量术中更简便可靠地获取待测面的相位场，提出了一种利用双频投影条纹的叠栅特性进行全自动相位解包裹的方法。该方法通过分析双频投影条纹的条纹级数之间及相位之间的关系，推导了一套利用该双频条纹的相位主值获取真实相位场的公式。在利用这套公式进行解包裹时，各点的相位求取都是单独进行的，因此不会出现误差传递的现象；同时求解的相位场保持了相移法求解的相位精度。实验证实了该方法的可行性，并得到很好的测量结果。

In order to simply obtain the phase of a surface in phase measuring profilometry (PMP), a fully automatic phase unwrapping method based on projected double spatial frequency fringes has been deduced. In this method, a series of formulas are deduced by analysing the relationship between the orders of and phase of the two fringes. Since the phase unwrapping is done on each point separately, the error propagation is avoided. Experiment has proved this method feasible, and a good measurement result is obtained.